MacViews: Overlay Scrollbars with Show/Hide Animations

ui/native_theme/native_theme_base.cc

Index: ui/native_theme/native_theme_base.cc
diff --git a/ui/native_theme/native_theme_base.cc b/ui/native_theme/native_theme_base.cc
index 1a7837ef3ebc6161d32094f9b56b21ebf3f759e7..368efeffec42eb4d873f2cd45d763548ae332405 100644
--- a/ui/native_theme/native_theme_base.cc
+++ b/ui/native_theme/native_theme_base.cc
@@ -233,7 +233,7 @@ void NativeThemeBase::Paint(SkCanvas* canvas,
       break;
     case kScrollbarHorizontalThumb:
     case kScrollbarVerticalThumb:
-      PaintScrollbarThumb(canvas, part, state, rect);
+      PaintScrollbarThumb(canvas, part, state, extra.scrollbar_thumb, rect);
       break;
     case kScrollbarHorizontalTrack:
     case kScrollbarVerticalTrack:
@@ -432,10 +432,12 @@ void NativeThemeBase::PaintScrollbarTrack(SkCanvas* canvas,
   DrawBox(canvas, rect, paint);
 }
 
-void NativeThemeBase::PaintScrollbarThumb(SkCanvas* canvas,
-                                           Part part,
-                                           State state,
-                                           const gfx::Rect& rect) const {
+void NativeThemeBase::PaintScrollbarThumb(
+    SkCanvas* canvas,
+    Part part,
+    State state,
+    const ScrollbarThumbExtraParams& extra_params,
+    const gfx::Rect& rect) const {
   const bool hovered = state == kHovered;
   const int midx = rect.x() + rect.width() / 2;
   const int midy = rect.y() + rect.height() / 2;